Error creating bean with name ‘entityManagerFactory’ defined in class path resource : Invocation of init method failed
I would start by adding the following dependency: and UPDATE: Or simply add the following dependency.
java
Constructor cannot be applied to given types?
A subclass does not have to have any constructor with “the same number of parameters in the constructor as the superclass”, but it does have to call some of its superclass’ constructors from its own constructor. If the superclass has a no-arg constructor, it is called by default if an explicit call to a superclass constructor is … Read more
fix java.net.SocketTimeoutException: Read timed out
Here are few pointers/suggestions for investigation I see that every time you vote, you call vote method which creates a fresh HTTP connection. This might be a problem. I would suggest to use a single HttpClient instance to post to the server. This way it wont create too many connections from the client side. At the end of everything, HttpClient needs to be … Read more
javac not working in windows command prompt
If you added it in the control panel while your command prompt was open, that won’t affect your current command prompt. You’ll need to exit and re-open or simply do: By way of checking, execute: from your command prompt and let us know what it is. Otherwise, make sure there is a javac in that directory by … Read more
What is the purpose of a listener in Java?
In the code example that you linked the KillMonsterEventListener provides a way for users of your API to tell you something like this: Here is a piece of code. When a monster is killed, call it back. I will decide what to do. This is a way for me to plug in my code at a … Read more
Java error: Implicit super constructor is undefined for default constructor
You get this error because a class which has no constructor has a default constructor, which is argument-less and is equivalent to the following code: However since your BaseClass declares a constructor (and therefore doesn’t have the default, no-arg constructor that the compiler would otherwise provide) this is illegal – a class that extends BaseClass can’t call super(); because … Read more
The @ symbol in java
The @ symbol specifies the Annotation types. This represents some metadata associated to your code The at sign character (@) indicates to the compiler that what follows is an annotation.
unreported exception java.io.FileNotFoundException; must be caught or declared to be thrown
You need to put the file processing statements inside a method:
What is the difference between String[] and String… in Java?
How should I declare main() method in Java? String[] and String… are the same thing internally, i. e., an array of Strings. The difference is that when you use a varargs parameter (String…) you can call the method like: And when you declare the parameter as a String array you MUST call this way: What’s actually the difference between String[] and String… if … Read more
Difference between HashMap and Map in Java..?
Possible Duplicate:Java – HashMap vs Map objects I want to know the difference between HashMap and Map in java..??